1 //===-- Instruction.cpp - Implement the Instruction class -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Instruction class for the VMCore library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Instruction.h"
15 #include "llvm/Type.h"
16 #include "llvm/Instructions.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Module.h"
19 #include "llvm/Operator.h"
20 #include "llvm/Support/CallSite.h"
21 #include "llvm/Support/LeakDetector.h"
24 Instruction::Instruction(Type *ty, unsigned it, Use *Ops, unsigned NumOps,
25 Instruction *InsertBefore)
26 : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
27 // Make sure that we get added to a basicblock
28 LeakDetector::addGarbageObject(this);
30 // If requested, insert this instruction into a basic block...
32 assert(InsertBefore->getParent() &&
33 "Instruction to insert before is not in a basic block!");
34 InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
38 Instruction::Instruction(Type *ty, unsigned it, Use *Ops, unsigned NumOps,
39 BasicBlock *InsertAtEnd)
40 : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
41 // Make sure that we get added to a basicblock
42 LeakDetector::addGarbageObject(this);
44 // append this instruction into the basic block
45 assert(InsertAtEnd && "Basic block to append to may not be NULL!");
46 InsertAtEnd->getInstList().push_back(this);
50 // Out of line virtual method, so the vtable, etc has a home.
51 Instruction::~Instruction() {
52 assert(Parent == 0 && "Instruction still linked in the program!");
53 if (hasMetadataHashEntry())
54 clearMetadataHashEntries();
58 void Instruction::setParent(BasicBlock *P) {
60 if (!P) LeakDetector::addGarbageObject(this);
62 if (P) LeakDetector::removeGarbageObject(this);
68 void Instruction::removeFromParent() {
69 getParent()->getInstList().remove(this);
72 void Instruction::eraseFromParent() {
73 getParent()->getInstList().erase(this);
76 /// insertBefore - Insert an unlinked instructions into a basic block
77 /// immediately before the specified instruction.
78 void Instruction::insertBefore(Instruction *InsertPos) {
79 InsertPos->getParent()->getInstList().insert(InsertPos, this);
82 /// insertAfter - Insert an unlinked instructions into a basic block
83 /// immediately after the specified instruction.
84 void Instruction::insertAfter(Instruction *InsertPos) {
85 InsertPos->getParent()->getInstList().insertAfter(InsertPos, this);
88 /// moveBefore - Unlink this instruction from its current basic block and
89 /// insert it into the basic block that MovePos lives in, right before
91 void Instruction::moveBefore(Instruction *MovePos) {
92 MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(),
96 /// Set or clear the unsafe-algebra flag on this instruction, which must be an
97 /// operator which supports this flag. See LangRef.html for the meaning of this
99 void Instruction::setHasUnsafeAlgebra(bool B) {
100 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
101 cast<FPMathOperator>(this)->setHasUnsafeAlgebra(B);
104 /// Set or clear the NoNaNs flag on this instruction, which must be an operator
105 /// which supports this flag. See LangRef.html for the meaning of this flag.
106 void Instruction::setHasNoNaNs(bool B) {
107 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
108 cast<FPMathOperator>(this)->setHasNoNaNs(B);
111 /// Set or clear the no-infs flag on this instruction, which must be an operator
112 /// which supports this flag. See LangRef.html for the meaning of this flag.
113 void Instruction::setHasNoInfs(bool B) {
114 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
115 cast<FPMathOperator>(this)->setHasNoInfs(B);
118 /// Set or clear the no-signed-zeros flag on this instruction, which must be an
119 /// operator which supports this flag. See LangRef.html for the meaning of this
121 void Instruction::setHasNoSignedZeros(bool B) {
122 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
123 cast<FPMathOperator>(this)->setHasNoSignedZeros(B);
126 /// Set or clear the allow-reciprocal flag on this instruction, which must be an
127 /// operator which supports this flag. See LangRef.html for the meaning of this
129 void Instruction::setHasAllowReciprocal(bool B) {
130 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
131 cast<FPMathOperator>(this)->setHasAllowReciprocal(B);
134 /// Convenience function for setting all the fast-math flags on this
135 /// instruction, which must be an operator which supports these flags. See
136 /// LangRef.html for the meaning of these flats.
137 void Instruction::setFastMathFlags(FastMathFlags FMF) {
138 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
139 cast<FPMathOperator>(this)->setFastMathFlags(FMF);
142 /// Determine whether the unsafe-algebra flag is set.
143 bool Instruction::hasUnsafeAlgebra() const {
144 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
145 return cast<FPMathOperator>(this)->hasUnsafeAlgebra();
148 /// Determine whether the no-NaNs flag is set.
149 bool Instruction::hasNoNaNs() const {
150 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
151 return cast<FPMathOperator>(this)->hasNoNaNs();
154 /// Determine whether the no-infs flag is set.
155 bool Instruction::hasNoInfs() const {
156 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
157 return cast<FPMathOperator>(this)->hasNoInfs();
160 /// Determine whether the no-signed-zeros flag is set.
161 bool Instruction::hasNoSignedZeros() const {
162 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
163 return cast<FPMathOperator>(this)->hasNoSignedZeros();
166 /// Determine whether the allow-reciprocal flag is set.
167 bool Instruction::hasAllowReciprocal() const {
168 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
169 return cast<FPMathOperator>(this)->hasAllowReciprocal();
172 /// Convenience function for getting all the fast-math flags, which must be an
173 /// operator which supports these flags. See LangRef.html for the meaning of
175 FastMathFlags Instruction::getFastMathFlags() const {
176 assert(isa<FPMathOperator>(this) && "setting fast-math flag on invalid op");
177 return cast<FPMathOperator>(this)->getFastMathFlags();
180 const char *Instruction::getOpcodeName(unsigned OpCode) {
183 case Ret: return "ret";
184 case Br: return "br";
185 case Switch: return "switch";
186 case IndirectBr: return "indirectbr";
187 case Invoke: return "invoke";
188 case Resume: return "resume";
189 case Unreachable: return "unreachable";
191 // Standard binary operators...
192 case Add: return "add";
193 case FAdd: return "fadd";
194 case Sub: return "sub";
195 case FSub: return "fsub";
196 case Mul: return "mul";
197 case FMul: return "fmul";
198 case UDiv: return "udiv";
199 case SDiv: return "sdiv";
200 case FDiv: return "fdiv";
201 case URem: return "urem";
202 case SRem: return "srem";
203 case FRem: return "frem";
205 // Logical operators...
206 case And: return "and";
207 case Or : return "or";
208 case Xor: return "xor";
210 // Memory instructions...
211 case Alloca: return "alloca";
212 case Load: return "load";
213 case Store: return "store";
214 case AtomicCmpXchg: return "cmpxchg";
215 case AtomicRMW: return "atomicrmw";
216 case Fence: return "fence";
217 case GetElementPtr: return "getelementptr";
219 // Convert instructions...
220 case Trunc: return "trunc";
221 case ZExt: return "zext";
222 case SExt: return "sext";
223 case FPTrunc: return "fptrunc";
224 case FPExt: return "fpext";
225 case FPToUI: return "fptoui";
226 case FPToSI: return "fptosi";
227 case UIToFP: return "uitofp";
228 case SIToFP: return "sitofp";
229 case IntToPtr: return "inttoptr";
230 case PtrToInt: return "ptrtoint";
231 case BitCast: return "bitcast";
233 // Other instructions...
234 case ICmp: return "icmp";
235 case FCmp: return "fcmp";
236 case PHI: return "phi";
237 case Select: return "select";
238 case Call: return "call";
239 case Shl: return "shl";
240 case LShr: return "lshr";
241 case AShr: return "ashr";
242 case VAArg: return "va_arg";
243 case ExtractElement: return "extractelement";
244 case InsertElement: return "insertelement";
245 case ShuffleVector: return "shufflevector";
246 case ExtractValue: return "extractvalue";
247 case InsertValue: return "insertvalue";
248 case LandingPad: return "landingpad";
250 default: return "<Invalid operator> ";
254 /// isIdenticalTo - Return true if the specified instruction is exactly
255 /// identical to the current one. This means that all operands match and any
256 /// extra information (e.g. load is volatile) agree.
257 bool Instruction::isIdenticalTo(const Instruction *I) const {
258 return isIdenticalToWhenDefined(I) &&
259 SubclassOptionalData == I->SubclassOptionalData;
262 /// isIdenticalToWhenDefined - This is like isIdenticalTo, except that it
263 /// ignores the SubclassOptionalData flags, which specify conditions
264 /// under which the instruction's result is undefined.
265 bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
266 if (getOpcode() != I->getOpcode() ||
267 getNumOperands() != I->getNumOperands() ||
268 getType() != I->getType())
271 // We have two instructions of identical opcode and #operands. Check to see
272 // if all operands are the same.
273 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
274 if (getOperand(i) != I->getOperand(i))
277 // Check special state that is a part of some instructions.
278 if (const LoadInst *LI = dyn_cast<LoadInst>(this))
279 return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
280 LI->getAlignment() == cast<LoadInst>(I)->getAlignment() &&
281 LI->getOrdering() == cast<LoadInst>(I)->getOrdering() &&
282 LI->getSynchScope() == cast<LoadInst>(I)->getSynchScope();
283 if (const StoreInst *SI = dyn_cast<StoreInst>(this))
284 return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
285 SI->getAlignment() == cast<StoreInst>(I)->getAlignment() &&
286 SI->getOrdering() == cast<StoreInst>(I)->getOrdering() &&
287 SI->getSynchScope() == cast<StoreInst>(I)->getSynchScope();
288 if (const CmpInst *CI = dyn_cast<CmpInst>(this))
289 return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
290 if (const CallInst *CI = dyn_cast<CallInst>(this))
291 return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
292 CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
293 CI->getAttributes() == cast<CallInst>(I)->getAttributes();
294 if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
295 return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
296 CI->getAttributes() == cast<InvokeInst>(I)->getAttributes();
297 if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this))
298 return IVI->getIndices() == cast<InsertValueInst>(I)->getIndices();
299 if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this))
300 return EVI->getIndices() == cast<ExtractValueInst>(I)->getIndices();
301 if (const FenceInst *FI = dyn_cast<FenceInst>(this))
302 return FI->getOrdering() == cast<FenceInst>(FI)->getOrdering() &&
303 FI->getSynchScope() == cast<FenceInst>(FI)->getSynchScope();
304 if (const AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(this))
305 return CXI->isVolatile() == cast<AtomicCmpXchgInst>(I)->isVolatile() &&
306 CXI->getOrdering() == cast<AtomicCmpXchgInst>(I)->getOrdering() &&
307 CXI->getSynchScope() == cast<AtomicCmpXchgInst>(I)->getSynchScope();
308 if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(this))
309 return RMWI->getOperation() == cast<AtomicRMWInst>(I)->getOperation() &&
310 RMWI->isVolatile() == cast<AtomicRMWInst>(I)->isVolatile() &&
311 RMWI->getOrdering() == cast<AtomicRMWInst>(I)->getOrdering() &&
312 RMWI->getSynchScope() == cast<AtomicRMWInst>(I)->getSynchScope();
313 if (const PHINode *thisPHI = dyn_cast<PHINode>(this)) {
314 const PHINode *otherPHI = cast<PHINode>(I);
315 for (unsigned i = 0, e = thisPHI->getNumOperands(); i != e; ++i) {
316 if (thisPHI->getIncomingBlock(i) != otherPHI->getIncomingBlock(i))
325 // This should be kept in sync with isEquivalentOperation in
326 // lib/Transforms/IPO/MergeFunctions.cpp.
327 bool Instruction::isSameOperationAs(const Instruction *I,
328 unsigned flags) const {
329 bool IgnoreAlignment = flags & CompareIgnoringAlignment;
330 bool UseScalarTypes = flags & CompareUsingScalarTypes;
332 if (getOpcode() != I->getOpcode() ||
333 getNumOperands() != I->getNumOperands() ||
335 getType()->getScalarType() != I->getType()->getScalarType() :
336 getType() != I->getType()))
339 // We have two instructions of identical opcode and #operands. Check to see
340 // if all operands are the same type
341 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
343 getOperand(i)->getType()->getScalarType() !=
344 I->getOperand(i)->getType()->getScalarType() :
345 getOperand(i)->getType() != I->getOperand(i)->getType())
348 // Check special state that is a part of some instructions.
349 if (const LoadInst *LI = dyn_cast<LoadInst>(this))
350 return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
351 (LI->getAlignment() == cast<LoadInst>(I)->getAlignment() ||
353 LI->getOrdering() == cast<LoadInst>(I)->getOrdering() &&
354 LI->getSynchScope() == cast<LoadInst>(I)->getSynchScope();
355 if (const StoreInst *SI = dyn_cast<StoreInst>(this))
356 return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
357 (SI->getAlignment() == cast<StoreInst>(I)->getAlignment() ||
359 SI->getOrdering() == cast<StoreInst>(I)->getOrdering() &&
360 SI->getSynchScope() == cast<StoreInst>(I)->getSynchScope();
361 if (const CmpInst *CI = dyn_cast<CmpInst>(this))
362 return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
363 if (const CallInst *CI = dyn_cast<CallInst>(this))
364 return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
365 CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
366 CI->getAttributes() == cast<CallInst>(I)->getAttributes();
367 if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
368 return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() &&
369 CI->getAttributes() ==
370 cast<InvokeInst>(I)->getAttributes();
371 if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this))
372 return IVI->getIndices() == cast<InsertValueInst>(I)->getIndices();
373 if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this))
374 return EVI->getIndices() == cast<ExtractValueInst>(I)->getIndices();
375 if (const FenceInst *FI = dyn_cast<FenceInst>(this))
376 return FI->getOrdering() == cast<FenceInst>(I)->getOrdering() &&
377 FI->getSynchScope() == cast<FenceInst>(I)->getSynchScope();
378 if (const AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(this))
379 return CXI->isVolatile() == cast<AtomicCmpXchgInst>(I)->isVolatile() &&
380 CXI->getOrdering() == cast<AtomicCmpXchgInst>(I)->getOrdering() &&
381 CXI->getSynchScope() == cast<AtomicCmpXchgInst>(I)->getSynchScope();
382 if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(this))
383 return RMWI->getOperation() == cast<AtomicRMWInst>(I)->getOperation() &&
384 RMWI->isVolatile() == cast<AtomicRMWInst>(I)->isVolatile() &&
385 RMWI->getOrdering() == cast<AtomicRMWInst>(I)->getOrdering() &&
386 RMWI->getSynchScope() == cast<AtomicRMWInst>(I)->getSynchScope();
391 /// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the
392 /// specified block. Note that PHI nodes are considered to evaluate their
393 /// operands in the corresponding predecessor block.
394 bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
395 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
396 // PHI nodes uses values in the corresponding predecessor block. For other
397 // instructions, just check to see whether the parent of the use matches up.
399 const PHINode *PN = dyn_cast<PHINode>(U);
401 if (cast<Instruction>(U)->getParent() != BB)
406 if (PN->getIncomingBlock(UI) != BB)
412 /// mayReadFromMemory - Return true if this instruction may read memory.
414 bool Instruction::mayReadFromMemory() const {
415 switch (getOpcode()) {
416 default: return false;
417 case Instruction::VAArg:
418 case Instruction::Load:
419 case Instruction::Fence: // FIXME: refine definition of mayReadFromMemory
420 case Instruction::AtomicCmpXchg:
421 case Instruction::AtomicRMW:
423 case Instruction::Call:
424 return !cast<CallInst>(this)->doesNotAccessMemory();
425 case Instruction::Invoke:
426 return !cast<InvokeInst>(this)->doesNotAccessMemory();
427 case Instruction::Store:
428 return !cast<StoreInst>(this)->isUnordered();
432 /// mayWriteToMemory - Return true if this instruction may modify memory.
434 bool Instruction::mayWriteToMemory() const {
435 switch (getOpcode()) {
436 default: return false;
437 case Instruction::Fence: // FIXME: refine definition of mayWriteToMemory
438 case Instruction::Store:
439 case Instruction::VAArg:
440 case Instruction::AtomicCmpXchg:
441 case Instruction::AtomicRMW:
443 case Instruction::Call:
444 return !cast<CallInst>(this)->onlyReadsMemory();
445 case Instruction::Invoke:
446 return !cast<InvokeInst>(this)->onlyReadsMemory();
447 case Instruction::Load:
448 return !cast<LoadInst>(this)->isUnordered();
452 /// mayThrow - Return true if this instruction may throw an exception.
454 bool Instruction::mayThrow() const {
455 if (const CallInst *CI = dyn_cast<CallInst>(this))
456 return !CI->doesNotThrow();
457 return isa<ResumeInst>(this);
460 /// isAssociative - Return true if the instruction is associative:
462 /// Associative operators satisfy: x op (y op z) === (x op y) op z
464 /// In LLVM, the Add, Mul, And, Or, and Xor operators are associative.
466 bool Instruction::isAssociative(unsigned Opcode) {
467 return Opcode == And || Opcode == Or || Opcode == Xor ||
468 Opcode == Add || Opcode == Mul;
471 /// isCommutative - Return true if the instruction is commutative:
473 /// Commutative operators satisfy: (x op y) === (y op x)
475 /// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
476 /// applied to any type.
478 bool Instruction::isCommutative(unsigned op) {
493 /// isIdempotent - Return true if the instruction is idempotent:
495 /// Idempotent operators satisfy: x op x === x
497 /// In LLVM, the And and Or operators are idempotent.
499 bool Instruction::isIdempotent(unsigned Opcode) {
500 return Opcode == And || Opcode == Or;
503 /// isNilpotent - Return true if the instruction is nilpotent:
505 /// Nilpotent operators satisfy: x op x === Id,
507 /// where Id is the identity for the operator, i.e. a constant such that
508 /// x op Id === x and Id op x === x for all x.
510 /// In LLVM, the Xor operator is nilpotent.
512 bool Instruction::isNilpotent(unsigned Opcode) {
513 return Opcode == Xor;
516 Instruction *Instruction::clone() const {
517 Instruction *New = clone_impl();
518 New->SubclassOptionalData = SubclassOptionalData;
522 // Otherwise, enumerate and copy over metadata from the old instruction to the
524 SmallVector<std::pair<unsigned, MDNode*>, 4> TheMDs;
525 getAllMetadataOtherThanDebugLoc(TheMDs);
526 for (unsigned i = 0, e = TheMDs.size(); i != e; ++i)
527 New->setMetadata(TheMDs[i].first, TheMDs[i].second);
529 New->setDebugLoc(getDebugLoc());